JPH08218704A - Engine controller having car burglarproof function - Google Patents

Abstract

PURPOSE: To prevent the burglary of a car unjustly using a back-up function. CONSTITUTION: An immobilization ECU 14 diagnoses the presence of car burglary by collating the password code of a key 11, and transmits the signal of the result of the disgnosis to an engine ECU 17, and the engine ECU 17 stops fuel injection-ignition output and an engine is stopped at the time of car burglary. The immobilization ECU 14 monitors an output from the engine ECU 17, and backs up engine control when the output reaches abnormality. The immobilization ECU 14 stops the back-up of engine control when the burglary of a car is decided at that time. The immobilization ECU 1 monitors the number of revolution of the engine at the time of the start of the engine, and the immobilization ECU 14 backs up engine control because abnormality is generated in the engine ECU 17 or a communication line 16 when the signal of diagnostic-result transmission requirement is not received from the engine ECU 17 even when the number of revolution of the engine reaches a fixed value or more and the immobilization ECU 14 waits in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device with a vehicle antitheft function having both a vehicle antitheft function and an engine control backup function.

[0002]

2. Description of the Related Art Conventionally, an engine control device using a microcomputer as an engine control circuit has been disclosed in, for example, JP-A-60-212655 and JP-A-2-115.
As shown in Japanese Patent Laid-Open No. 552, a backup circuit composed of a relatively simple hardware circuit is provided in the engine control device in addition to the engine control microcomputer, and the backup circuit is provided when the engine control microcomputer becomes abnormal. By backing up the engine control with, the vehicle can be driven even when the engine control microcomputer is abnormal.

On the other hand, in a vehicle equipped with a recent vehicle theft prevention system, for example, as shown in Japanese Utility Model Laid-Open No. 63-24066, a key for starting an engine is provided with a secret code and the key is inserted into a key cylinder. When the engine is started, the code of the key is read by the reader on the side of the key cylinder and compared with the code stored in the theft-diagnosis microcomputer, so that the engine can be started with the proper key. If the engine is not started with the proper key, it is determined that the vehicle is stolen, and the output of the ignition signal / fuel injection signal (engine start) from the engine control device is prohibited to prevent the vehicle theft. There are things that prevent it.

[0004]

In a vehicle in which a vehicle antitheft system is combined with the above-described engine control device having a backup circuit, when the microcomputer for engine control becomes abnormal due to failure or vandalism by a thief. , The process according to the theft diagnosis result from the theft diagnosis microcomputer is not executed by the engine control microcomputer, and the backup circuit replaces the engine control microcomputer with the theft prevention result from the theft prevention microcomputer. Since the ignition signal and the fuel injection signal are output regardless of the above, even if the theft diagnosis microcomputer determines that the theft has occurred (starting operation with an illegal key), an incorrect key is used when the engine control microcomputer is abnormal. You can start the engine and drive It is not possible to prevent the theft of the vehicle.
Moreover, the conventional backup circuit using a simple hardware circuit has a drawback that a person having electrical knowledge can generate a pack-up signal by a relatively easy modification, and the protection against illegal modification is weak.

In order to eliminate these drawbacks, another microcomputer for air conditioning control, brake control, etc. is provided with a backup function for engine control, and this microcomputer also has the same function as the engine control microcomputer. In addition, it is conceivable that the theft diagnosis microcomputer sends a signal of the theft diagnosis result and the backup function is stopped when the theft occurs.

However, in the case of this configuration, it is necessary to newly provide a communication line between the control microcomputer having another backup function and the theft diagnosis microcomputer. Moreover, if the vehicle anti-theft system is installed as an option, it is necessary to change the other control microcomputer to a high-performance microcomputer with a backup function or to wire a new communication line. However, there is a problem that the versatility is low and the cost is high because the circuit configuration related to the control needs to be drastically changed.

The present invention has been made in view of the above circumstances, and therefore an object thereof is to prevent the vehicle having the backup function illegally used from being stolen and to make it difficult to illegally modify the backup function. Vehicle anti-theft function that can increase the crime prevention effect, and increase the versatility and reduce the cost by reducing the changes from the vehicle that is not equipped with the vehicle anti-theft system. It is to provide an engine control device.

[0008]

In order to achieve the above object, an engine control device with a vehicle antitheft function according to a first aspect of the present invention comprises a theft diagnosis microcomputer for diagnosing theft of a vehicle, and an engine. An engine control microcomputer for controlling the engine, the signal for theft diagnosis result is transmitted from the theft diagnosis microcomputer to the engine control microcomputer, and a process according to the theft diagnosis result is transmitted to the engine control microcomputer. The theft-diagnosis microcomputer monitors the operation of the engine-control microcomputer and backs up the engine control when the operation becomes abnormal; A means to stop the backup of engine control when it judges And it has a configuration that includes.

In this structure, the engine controlling microcomputer outputs a diagnostic result transmission request signal to the theft diagnosing microcomputer when the engine speed becomes equal to or higher than a predetermined value when the engine is started. And a means for transmitting the signal of the theft diagnosis result to the engine control microcomputer when the signal of the diagnosis result transmission request is received, and an engine speed at the time of starting the engine. And a means for backing up the engine control when the engine speed exceeds a predetermined value and does not receive the diagnostic result transmission request signal even after waiting for a while.

According to a third aspect of the invention, the theft diagnosis microcomputer monitors the engine control output of the engine control microcomputer and backs up the engine control when the engine control output becomes abnormal. It may be configured to include means.

In this case, as in claim 4, the theft diagnosis microcomputer monitors the engine control output of the engine control microcomputer even during the engine control backup, and the engine control output has returned to the normal state. It may be configured to include means for returning to engine control by the engine control microcomputer at times.

[0012]

According to the above-mentioned structure of the invention, the theft-diagnosis microcomputer diagnoses the presence or absence of theft of the vehicle, sends a signal of the diagnosis result to the engine-control microcomputer, and the engine-control microcomputer. Make the device perform processing according to the theft diagnosis result. Further, the theft diagnosis microcomputer monitors the operation of the engine control microcomputer and backs up the engine control when the operation becomes abnormal. At this time, the theft-diagnosis microcomputer stops the backup of engine control when it determines that the vehicle has been stolen. This makes it possible to prevent the vehicle from being stolen by illegally using the backup function that could not be prevented in the past. In this case, since the anti-theft diagnosis microcomputer has a backup function for engine control, it is not necessary to provide a backup function to other control microcomputers, and it is not necessary to use a vehicle anti-theft system. Changes can be reduced.

Further, in the present invention, the engine control microcomputer outputs a diagnostic result transmission request signal to the theft diagnosis microcomputer when the engine speed becomes equal to or higher than a predetermined value when the engine is started. this is,
Due to the low battery voltage when the starter is activated,
It is possible that the power supply voltage of the engine control microcomputer may temporarily fall below the normal operating voltage and cause a malfunction.Therefore, wait for the engine speed to rise above a specified value and recover the battery voltage before communication. Is what starts. Then, the theft diagnosis microcomputer transmits a signal of the theft diagnosis result to the engine control microcomputer when receiving the signal of the diagnosis result transmission request from the engine control microcomputer.
Further, the theft diagnosis microcomputer monitors the engine speed at the time of starting the engine, and when the engine speed reaches or exceeds the predetermined value and does not receive the diagnostic result transmission request signal even after waiting for a while, the engine control microcomputer detects The theft diagnosis microcomputer backs up the engine control because of an abnormality or an abnormality such as a disconnection in the communication line. As a result, the engine control can be backed up promptly when the engine control microcomputer is abnormal or the communication line is abnormal.

According to another aspect of the present invention, the theft diagnosis microcomputer monitors an engine control output (for example, an ignition signal or an injection signal) of the engine control microcomputer, and when the engine control output becomes abnormal, the engine is controlled. Back up control. In this case, since the engine control microcomputer determines whether the engine control microcomputer is normal or abnormal, accurate determination can be performed in real time.

Further, in the present invention, the theft-diagnosis microcomputer monitors the engine control output of the engine control microcomputer even during the engine control backup, and controls the engine when the engine control output returns to the normal state. Return to engine control by the microcomputer. Therefore, for example, when the engine control microcomputer malfunctions due to a temporary battery voltage drop, the engine control microcomputer should immediately return to engine control when the battery voltage recovers and returns to normal operation. You can

[0016]

An embodiment of the present invention will be described below with reference to the drawings. First, the schematic configuration of the entire system will be described with reference to FIG. The key 11 is provided with a memory 12 for storing a predetermined secret code, and the key cylinder 13 into which the key 11 is inserted is provided with a reading device (not shown) for reading the secret code of the key 11. The personal identification code read by this reading device is input to a theft diagnosis microcomputer (hereinafter referred to as “immobil ECU”) 14 having a CPU 31, a memory 15, an input / output port 32 and the like. The personal identification code input to the immobilizer ECU 14 is collated with the personal identification code stored in the memory 15 to determine whether or not the key 11 inserted in the key cylinder 13 is a regular key. Otherwise, the vehicle is diagnosed as stolen. This theft diagnosis process is shown in FIG.
The signal of the theft diagnosis result is input to the engine control microcomputer (hereinafter referred to as “engine ECU”) 17 through the communication line 16.

When the key 11 is inserted into the key cylinder 13 and is rotated, the ignition switch 18 and the starter switch 19 are sequentially turned on, and when the ignition switch 18 is turned on, the immobilizer ECU 14, engine ECU 17, ignition device 20 and fuel injection are performed. The device 21 is supplied with the power of the battery 22, and the starter switch 1
When the switch 9 is turned on, the power of the battery 22 is supplied to the starter 23.

On the other hand, the engine ECU 17 is provided with an engine speed signal NE from the rotation sensor 24 and an intake air amount sensor 2
Various data relating to the engine operating state such as the intake air amount signal from 5 are input via the input / output port 26. The engine ECU 17 has a CPU for performing various arithmetic processes.
27, RO that stores various programs and constants described later
M28, a RAM 29, etc. for temporarily storing various input data and calculation results are built in, and the CPU 27 calculates the fuel injection amount, ignition timing, etc. based on the data on the engine operating state temporarily stored in the RAM 29. , Output line 3 for fuel injection signal and ignition signal according to the calculation result
It outputs to the fuel injection device 21 and the ignition device 20 via 3, 34 to control the engine.

When the engine control by the engine ECU 17 becomes abnormal due to a failure or the like, the immobilizer ECU 14 does not back up the engine control, not the conventional backup circuit having a hardware structure. The immobilizer ECU 14 outputs the output line 34 from the engine ECU 17 in order to monitor the operation of the engine ECU 17.
The ignition signal (or fuel injection signal) output via (or 33) is monitored, and the engine rotation speed signal NE from the rotation sensor 24 is read to monitor the rotation state of the engine. The immobilizer ECU 14 is the engine ECU 1.
When the abnormality of No. 7 is detected, the fixed fuel injection signal and ignition signal are output to the fuel injection device 21 and the ignition device 20 via the backup output lines 35 and 36 to back up the engine control. However, when the immobilizer ECU 14 determines that the vehicle has been stolen, the backup of engine control is stopped.

The specific processing contents of the software that realizes the vehicle theft prevention function and the engine control backup function will be described below with reference to the flowcharts shown in FIGS. 2 to 5. The process of FIG. 2 is performed by the engine ECU 17, and the process of FIGS. 3 to 5 is performed by the immobilizer ECU 14.

FIG. 2 is a flow chart showing the output processing of the transmission request signal of the collation result (theft diagnosis result) to the immobilizer ECU 14. This routine executes the engine EC every predetermined time (for example, every 8 ms) after power is supplied to the engine ECU 17 (that is, after the ignition switch 18 is turned on).
It is interrupted at U17.

When the processing of this routine is started, first,
In step 201, the engine speed Ne is 500 rpm
It is determined whether or not, that is, whether or not the engine start is completed,
If the engine speed Ne is less than 500 rpm, this routine is ended, but if it is 500 rpm or more, the process proceeds to step 202, and the data showing the verification result of the personal identification code obtained by the process executed by the immobilizer ECU 14 is given to the engine E.
A collation result transmission request signal is output to the immobilizer ECU 14 so as to be transmitted to the CU 17, and this routine ends.
In this way, the reason why the verification result transmission request signal is output by waiting until the engine speed Ne becomes 500 rpm or more is that the power supply voltage of the engine ECU 17 is temporarily reduced due to the voltage drop of the battery 22 when the starter 23 is operated. This is because a malfunction may occur due to a voltage lower than the normal operating voltage.

On the other hand, FIG. 3 is a flow chart showing a process of receiving a transmission request signal from the engine ECU 17 in the immobilizer ECU 14 and a process of transmitting a personal identification code (verification result) to the engine ECU 17. This routine is engine EC
After receiving the transmission request signal from U17, the immobilizer ECU 14 performs an interrupt process at predetermined time intervals (for example, 8 ms).

When the processing of this routine is started, first, at step 301, it is judged whether or not the secret code (transmission request signal) is received from the engine ECU 17, and if not received, nothing is processed. This routine ends, but if it has been received, the process proceeds to step 302. This step 3
In 02, it is determined whether or not the received code matches the correct personal identification code. If it is determined that they match, the process proceeds to step 303 to determine the presence or absence of theft. Here, the theft is judged by a method other than theft diagnosis based on the personal identification code transmitted from the engine ECU 17. For example, when the door is unlocked illegally, or the personal identification code transmitted from the key cylinder 13 of the key 11 is used. Immobility ECU1
When the personal identification code stored in the memory 15 of No. 4 is compared and it is determined that the two do not match, the immobilizer ECU 1
When the 4 itself determines that it is stolen, it is determined to be stolen (Yes) in step 303, and in this case also, the personal identification code (permission signal) is not transmitted.

By the above processing, only when the correct secret code (transmission request signal) is received from the engine ECU 17 and the immobilizer ECU 14 itself is also determined to be normal.
Proceeding to step 304, the memory 15 of the immobilizer ECU 14
The personal identification code (permission signal) stored therein is transmitted to the engine ECU 17 through the communication line 16.

On the other hand, FIG. 4 is a flow chart showing the abnormality determination processing of the engine ECU 17 in the immobilizer ECU 14. This routine considers backup injection ignition processing, and is processed, for example, at a rotation cycle (engine speed signal NE interrupt processing timing). For example, if the engine ECU 17 fails, the collation result transmission request is not transmitted, so the immobilizer ECU 14 makes its own theft determination, and if it is not theft, shifts to the backup mode in which the engine control is backed up.

Specifically, first, at step 401, it is judged if the engine speed Ne is 500 rpm or more. That is, since the verification result transmission request is transmitted from the engine ECU 17 when Ne ≧ 500 rpm, the reception timing of the verification result transmission request is determined on the immobilizer ECU 14 side in step 401. However, even if the engine speed Ne becomes 500 rpm or more, the processing timings are different between the engine ECU 17 and the immobilizer ECU 14, and thus the immobilizer ECU 14 shifts to the backup mode before receiving the verification result transmission request from the engine ECU 17 in a normal state. A time counter CNT is provided to see a margin of a predetermined time (here, for example, 2 seconds) so as not to allow it (see step 404). Therefore, when it is judged at step 401 that Ne <500 rpm, the routine proceeds to step 406, where the counter CNT is cleared and this routine is ended.

After that, when Ne ≧ 500 rpm, the routine proceeds to step 402, where it is judged whether or not theft. For example, if the door is unlocked illegally, or the secret code sent from the key cylinder 12 and the immobilizer ECU 14
When it is determined that they do not match each other by comparing the secret code stored in the memory 15 of the immobilizer ECU 14
If it is determined that the theft is stolen, “Y” is determined in step 402.
It is determined to be "es", and this routine is ended without performing the subsequent processing. On the other hand, if it is determined to be normal (No) in step 402, the process proceeds to step 403, where the engine ECU
It is determined from 17 whether or not the personal identification code of the verification result transmission request is received. If the personal identification code of the verification result transmission request is received even once in the past while the ignition switch 19 is turned on, there is a possibility that the fuel injection / ignition process is normally performed on the engine ECU 17 side. This routine is terminated without performing.

If the personal identification code of the verification result transmission request has not been received in the past (one cycle of turning on / off the ignition switch 19), the process proceeds to step 404 and the count value of the time counter CNT is 2 seconds or more. Or not. As described above, the time counter CNT is a time counter for giving a margin to the transition to the backup mode from the time when Ne ≧ 500 rpm, and the process of constantly incrementing at the regular timing (for example, 8 ms timing). repeat. If the secret code of the verification result transmission request is not received even after waiting for 2 seconds after Ne ≧ 500 rpm, the engine ECU 17 is abnormal or the communication line 16 is broken or the like. Go to step 405,
Move to backup mode. In this backup mode, fixed fuel injection / ignition processing is executed in a rotation cycle. At this time, the anti-theft process of step 402 preliminarily determines the theft on the immobilizer ECU 14 side. Therefore, if it is determined to be theft, the transition to the backup mode is prohibited, and the theft intentionally using the backup mode is stolen. Can be prevented.

By the way, the reason why the determination value of the engine speed Ne is set to 500 rpm in step 401 is that the starter 23 changes the engine speed Ne even if the engine ECU 17 fails and both fuel injection and ignition are stopped. This is because it is considered that the speed will exceed 500 rpm. Therefore, even if the engine ECU 17 fails when the driver tries to start the engine, it is possible to shift to the backup mode while the starter 23 is driven and to perform the evacuation traveling degree. become. The judgment value of the engine speed Ne is 50.
Not limited to 0 rpm, for example 450 rpm, 550 r
Needless to say, other rotation speeds such as pm and 600 rpm may be used.

On the other hand, FIG. 5 shows an immobilizer ECU 1 similar to FIG.
4 is a flowchart showing a failure detection process of the engine ECU 17 in FIG. This routine is also performed in consideration of backup injection ignition processing, for example, at a rotation cycle (engine speed signal NE interrupt processing timing).

When the processing of this routine is started, it is first determined in step 501 whether or not it is theft by the same method as in step 402, and if it is determined that it is theft (Yes), the subsequent processing is performed. Without this routine, it ends. on the other hand,
If it is determined to be normal (No) in step 501, the process proceeds to step 502, and it is determined whether or not the current control mode is the backup mode, based on whether or not the backup flag XBUP is "1". This backup flag XBUP is reset to "0" at the time of initialization, and if the backup mode is executed even once while the ignition switch 19 is on, step 50 described later will be performed.
It is set to "1" at 5.

If the backup mode has never been executed in the past (during one cycle of turning on / off the ignition switch 19) (XBUP = 0), step 5
03, the output line 34 (or 3) is used to determine whether the engine ECU 17 is performing ignition (or injection).
3) is monitored and judged. Ignition (or injection) when the ignition signal is not output even when Ne ≧ 500 rpm
Is not performed normally, so proceed to Step 505,
By switching to the backup mode, fixed fuel injection / ignition processing is executed in a rotation cycle. On the other hand, when the ignition signal (or the injection signal) is normally output, this routine is terminated without shifting to the backup mode.

On the other hand, if it is determined in step 502 that the backup mode is currently set (XBUP = 1), the process proceeds to step 504, and the ignition signal (or injection signal) and the output line 34 output by itself are output. It is determined whether the signals of (or 33) match. This is processing for prohibiting the backup processing in the immobilizer ECU 14 and returning to normal operation when the engine ECU 17 returns to normal operation during execution of the backup mode. Immobility ECU
If the same signal that 14 itself outputs is detected,
Since the ignition signal (or the injection signal) is not output from the engine ECU 17, that is, it is determined that the engine ECU 17 is out of order, the backup process is continuously executed in step 506. If a signal that does not match the signal output by the immobilizer ECU 14 itself is detected, the engine ECU
A signal is output from the 17 side, that is, the engine ECU
Since it is considered that 17 has returned to normal, step 50
In step 6, the backup flag XBUP is reset to "0" and the backup process is stopped.

According to the present embodiment described above, the engine control is backed up by the immobilizer ECU 14. Therefore, if the engine ECU 17 is intentionally destroyed, the immobilizer ECU 14 determines that it is stolen. ,
It is possible to stop the engine-controlled backup, and prevent the vehicle from being stolen by illegally using the backup function. Moreover, since the engine control is backed up by the software of the immobilizer ECU 14, it is difficult to illegally modify the backup mode as compared with the conventional backup circuit using a simple hardware circuit, and the crime prevention effect can be enhanced.

Further, by providing the immobilizer ECU 14 with a backup function for engine control, it is not necessary to provide a backup function to other control microcomputers, which is a change from a vehicle not equipped with a vehicle antitheft system. Can be reduced. For this reason, even when the vehicle antitheft system is optionally installed, it is possible to minimize the change in the control-related circuit configuration and to satisfy the requirements of high versatility and cost reduction.

Moreover, the immobilizer ECU 14 monitors the engine speed Ne at the time of engine start, and the engine speed N
When e becomes a predetermined value (for example, 500 rpm) or more and the verification result transmission request signal is not received even after waiting for a while,
The engine ECU 17 is abnormal or the communication line 16
It is judged that there is an abnormality such as a wire break in the engine, and the engine control is backed up.
When the U17 is abnormal or the communication line 20 is abnormal, the engine control can be quickly backed up, and the backup performance can be improved.

Further, the immobilizer ECU 14 is provided with the engine EC.
Since the normality / abnormality of U17 is determined by the engine control output (ignition signal or injection signal), accurate determination can be performed in real time.

Moreover, the immobilizer ECU 14 monitors the engine control output (ignition signal or injection signal) of the engine ECU 17 even during the engine control backup, and when this engine control output returns to the normal state, the engine ECU outputs.
Since it was made to return to the engine control by 17,
For example, when the engine ECU 17 malfunctions due to a temporary battery voltage drop, the engine control by the engine ECU 17 can be immediately returned to when the battery voltage is restored and the normal operation is restored. Can be done accurately.

In the above embodiment, the memory 1 of the key 11 is
2. Store the secret code in 2 and press the key 11 in the key cylinder 1
Although the password code on the key 11 side is read inside the key cylinder 13 when it is inserted into 3 and rotated, for example, a security system for detecting an illegal unlocking of a door lock, or a driver's voice code. The present invention can also be applied to and implemented in a security system that is entered as a code.

[0041]

As is apparent from the above description, according to the structure of the first aspect of the present invention, the engine control backup is performed by the theft diagnosis microcomputer. If the vehicle is destroyed, the engine control backup can be stopped at the discretion of the theft-diagnosis microcomputer itself, preventing the vehicle from being stolen by illegally using the backup function. It is difficult to tamper with creating a backup mode compared to a simple hard circuit backup circuit, and the crime prevention effect can be enhanced. Moreover, by providing the anti-theft diagnosis microcomputer with the backup function for engine control, it is not necessary to provide the backup function with other control microcomputers. Therefore, even if the vehicle anti-theft system is installed as an option, It is possible to reduce changes from a vehicle that is not equipped with an anti-theft system, improve versatility, and meet cost reduction requirements.

Further, in the second aspect of the invention, the theft diagnosis microcomputer monitors the engine speed at the time of starting the engine, and does not receive the verification result transmission request signal even if the engine speed reaches a predetermined value or more and waits for a while. Since the engine control is sometimes backed up, the engine control can be quickly backed up when the engine control microcomputer is abnormal or the communication line is abnormal, and the backup performance can be improved.

Further, in the third aspect of the invention, the theft diagnosis microcomputer determines whether the engine control microcomputer is normal or abnormal based on the engine control output. Therefore, it is possible to make an accurate determination in real time.

Further, in the present invention, the theft diagnosis microcomputer monitors the engine control output of the engine control microcomputer even during the engine control backup, and the engine control output is restored when the engine control output returns to the normal state. Since the engine control by the engine control microcomputer is restored, in the case of a temporary malfunction of the engine control microcomputer, the engine control by the engine control microcomputer should be immediately returned when the engine control microcomputer returns to normal operation. The return operation can be accurately performed in real time.

[Brief description of drawings]

FIG. 1 is a block diagram of an entire system showing an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of a transmission process on the engine ECU side.

FIG. 3 is a flowchart showing a flow of transmission / reception processing on the immobilizer ECU side.

FIG. 4 is a flowchart showing a flow of abnormality determination processing (1) on the immobilizer ECU side.

FIG. 5 is a flowchart showing a flow of abnormality determination processing (2) on the immobilizer ECU side.

[Explanation of symbols]

11 ... Key, 12 ... Memory, 13 ... Key cylinder, 14
... Immobility ECU (theft diagnosis microcomputer),
15 ... Memory, 17 ... Engine ECU (engine control microcomputer), 18 ... Ignition switch, 19 ... Starter switch, 20 ... Ignition device, 21 ...
Fuel injection device, 22 ... Battery, 24 ... Rotation sensor.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location F02P 11/04 301 F02P 11/04 301C

Claims (4)

[Claims] 1. A theft diagnosis result including a theft diagnosis microcomputer for diagnosing the presence or absence of theft of a vehicle and an engine control microcomputer for controlling an engine, wherein the theft diagnosis microcomputer transfers to the engine control microcomputer. Of the engine control device with the vehicle anti-theft function, the engine control microcomputer performing processing according to the theft diagnosis result by transmitting the signal of Vehicle theft including means for monitoring the operation of a computer and backing up the engine control when the operation becomes abnormal, and means for stopping the backup of the engine control when it is determined that the vehicle is stolen. Engine control device with prevention function. 2. The engine control microcomputer includes means for outputting a diagnostic result transmission request signal to the theft diagnosis microcomputer when the engine speed reaches or exceeds a predetermined value when the engine is started. The diagnostic microcomputer transmits a signal of a theft diagnostic result to the engine control microcomputer when the diagnostic result transmission request signal is received, and monitors the engine speed when the engine is started. The engine control device with a vehicle anti-theft function according to claim 1, further comprising means for backing up the engine control when the signal of the diagnostic result transmission request is not received even after waiting for a while after reaching a predetermined value or more. . 3. The theft diagnosis microcomputer includes means for monitoring the engine control output of the engine control microcomputer and backing up the engine control when the engine control output becomes abnormal. The engine control device with a vehicle antitheft function according to claim 1 or 2. 4. The theft diagnosis microcomputer monitors the engine control output of the engine control microcomputer even during engine control backup, and when the engine control output returns to a normal state, the engine control microcomputer. The engine control device with a vehicle antitheft function according to claim 3, further comprising means for returning to the engine control by the.